
/* @(#)w_sinh.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */


/*
FUNCTION
        <<sinh>>, <<sinhf>>---hyperbolic sine

INDEX
    sinh
INDEX
    sinhf

ANSI_SYNOPSIS
        #include <math.h>
        double sinh(double <[x]>);
        float  sinhf(float <[x]>);

TRAD_SYNOPSIS
        #include <math.h>
        double sinh(<[x]>)
        double <[x]>;

        float  sinhf(<[x]>)
        float <[x]>;

DESCRIPTION
    <<sinh>> computes the hyperbolic sine of the argument <[x]>.
    Angles are specified in radians.   <<sinh>>(<[x]>) is defined as
    @ifnottex
    . (exp(<[x]>) - exp(-<[x]>))/2
    @end ifnottex
    @tex
    $${e^x - e^{-x}}\over 2$$
    @end tex

    <<sinhf>> is identical, save that it takes and returns <<float>> values.

RETURNS
    The hyperbolic sine of <[x]> is returned.

    When the correct result is too large to be representable (an
    overflow),  <<sinh>> returns <<HUGE_VAL>> with the
    appropriate sign, and sets the global value <<errno>> to
    <<ERANGE>>.

    You can modify error handling for these functions with <<matherr>>.

PORTABILITY
    <<sinh>> is ANSI C.
    <<sinhf>> is an extension.

QUICKREF
    sinh ansi pure
    sinhf - pure
*/

/*
 * wrapper sinh(x)
 */

#include "fdlibm.h"
#include <errno.h>

#ifndef _DOUBLE_IS_32BITS

#ifdef __STDC__
    double sinh(double x)       /* wrapper sinh */
#else
    double sinh(x)          /* wrapper sinh */
    double x;
#endif
{
#ifdef _IEEE_LIBM
    return __ieee754_sinh(x);
#else
    double z;
    struct exception exc;
    z = __ieee754_sinh(x);
    if(_LIB_VERSION == _IEEE_) return z;
    if(!finite(z)&&finite(x)) {
        /* sinh(finite) overflow */
#ifndef HUGE_VAL
#define HUGE_VAL inf
        double inf = 0.0;

        SET_HIGH_WORD(inf,0x7ff00000);  /* set inf to infinite */
#endif
        exc.type = OVERFLOW;
        exc.name = "sinh";
        exc.err = 0;
        exc.arg1 = exc.arg2 = x;
        if (_LIB_VERSION == _SVID_)
           exc.retval = ( (x>0.0) ? HUGE : -HUGE);
        else
           exc.retval = ( (x>0.0) ? HUGE_VAL : -HUGE_VAL);
        if (_LIB_VERSION == _POSIX_)
           Djy_SaveLastError(ERANGE);
        else if (!matherr(&exc)) {
           Djy_SaveLastError(ERANGE);
        }
        if (exc.err != 0)
           Djy_SaveLastError(exc.err);
            return exc.retval;
    } else
        return z;
#endif
}

#endif /* defined(_DOUBLE_IS_32BITS) */
